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- /* Native-dependent code for FreeBSD/aarch64.
- Copyright (C) 2017-2022 Free Software Foundation, Inc.
- This file is part of GDB.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- #include "defs.h"
- #include "arch-utils.h"
- #include "inferior.h"
- #include "regcache.h"
- #include "target.h"
- #include "nat/aarch64-hw-point.h"
- #include <sys/param.h>
- #include <sys/ptrace.h>
- #include <machine/armreg.h>
- #include <machine/reg.h>
- #include "fbsd-nat.h"
- #include "aarch64-fbsd-tdep.h"
- #include "aarch64-nat.h"
- #include "inf-ptrace.h"
- #if __FreeBSD_version >= 1400005
- #define HAVE_DBREG
- #include <unordered_set>
- #endif
- #ifdef HAVE_DBREG
- struct aarch64_fbsd_nat_target final
- : public aarch64_nat_target<fbsd_nat_target>
- #else
- struct aarch64_fbsd_nat_target final : public fbsd_nat_target
- #endif
- {
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- #ifdef HAVE_DBREG
- /* Hardware breakpoints and watchpoints. */
- bool stopped_by_watchpoint () override;
- bool stopped_data_address (CORE_ADDR *) override;
- bool stopped_by_hw_breakpoint () override;
- bool supports_stopped_by_hw_breakpoint () override;
- void post_startup_inferior (ptid_t) override;
- void post_attach (int pid) override;
- void low_new_fork (ptid_t parent, pid_t child) override;
- void low_delete_thread (thread_info *) override;
- void low_prepare_to_resume (thread_info *) override;
- private:
- void probe_debug_regs (int pid);
- static bool debug_regs_probed;
- #endif
- };
- static aarch64_fbsd_nat_target the_aarch64_fbsd_nat_target;
- bool aarch64_fbsd_nat_target::debug_regs_probed;
- /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
- for all registers. */
- void
- aarch64_fbsd_nat_target::fetch_registers (struct regcache *regcache,
- int regnum)
- {
- fetch_register_set<struct reg> (regcache, regnum, PT_GETREGS,
- &aarch64_fbsd_gregset);
- fetch_register_set<struct fpreg> (regcache, regnum, PT_GETFPREGS,
- &aarch64_fbsd_fpregset);
- }
- /* Store register REGNUM back into the inferior. If REGNUM is -1, do
- this for all registers. */
- void
- aarch64_fbsd_nat_target::store_registers (struct regcache *regcache,
- int regnum)
- {
- store_register_set<struct reg> (regcache, regnum, PT_GETREGS, PT_SETREGS,
- &aarch64_fbsd_gregset);
- store_register_set<struct fpreg> (regcache, regnum, PT_GETFPREGS,
- PT_SETFPREGS, &aarch64_fbsd_fpregset);
- }
- #ifdef HAVE_DBREG
- /* Set of threads which need to update debug registers on next resume. */
- static std::unordered_set<lwpid_t> aarch64_debug_pending_threads;
- /* Implement the "stopped_data_address" target_ops method. */
- bool
- aarch64_fbsd_nat_target::stopped_data_address (CORE_ADDR *addr_p)
- {
- siginfo_t siginfo;
- struct aarch64_debug_reg_state *state;
- if (!fbsd_nat_get_siginfo (inferior_ptid, &siginfo))
- return false;
- /* This must be a hardware breakpoint. */
- if (siginfo.si_signo != SIGTRAP
- || siginfo.si_code != TRAP_TRACE
- || siginfo.si_trapno != EXCP_WATCHPT_EL0)
- return false;
- const CORE_ADDR addr_trap = (CORE_ADDR) siginfo.si_addr;
- /* Check if the address matches any watched address. */
- state = aarch64_get_debug_reg_state (inferior_ptid.pid ());
- return aarch64_stopped_data_address (state, addr_trap, addr_p);
- }
- /* Implement the "stopped_by_watchpoint" target_ops method. */
- bool
- aarch64_fbsd_nat_target::stopped_by_watchpoint ()
- {
- CORE_ADDR addr;
- return stopped_data_address (&addr);
- }
- /* Implement the "stopped_by_hw_breakpoint" target_ops method. */
- bool
- aarch64_fbsd_nat_target::stopped_by_hw_breakpoint ()
- {
- siginfo_t siginfo;
- struct aarch64_debug_reg_state *state;
- if (!fbsd_nat_get_siginfo (inferior_ptid, &siginfo))
- return false;
- /* This must be a hardware breakpoint. */
- if (siginfo.si_signo != SIGTRAP
- || siginfo.si_code != TRAP_TRACE
- || siginfo.si_trapno != EXCP_WATCHPT_EL0)
- return false;
- return !stopped_by_watchpoint();
- }
- /* Implement the "supports_stopped_by_hw_breakpoint" target_ops method. */
- bool
- aarch64_fbsd_nat_target::supports_stopped_by_hw_breakpoint ()
- {
- return true;
- }
- /* Fetch the hardware debug register capability information. */
- void
- aarch64_fbsd_nat_target::probe_debug_regs (int pid)
- {
- if (!debug_regs_probed)
- {
- struct dbreg reg;
- debug_regs_probed = true;
- aarch64_num_bp_regs = 0;
- aarch64_num_wp_regs = 0;
- if (ptrace(PT_GETDBREGS, pid, (PTRACE_TYPE_ARG3) ®, 0) == 0)
- {
- switch (reg.db_debug_ver)
- {
- case AARCH64_DEBUG_ARCH_V8:
- case AARCH64_DEBUG_ARCH_V8_1:
- case AARCH64_DEBUG_ARCH_V8_2:
- case AARCH64_DEBUG_ARCH_V8_4:
- break;
- default:
- return;
- }
- aarch64_num_bp_regs = reg.db_nbkpts;
- if (aarch64_num_bp_regs > AARCH64_HBP_MAX_NUM)
- {
- warning (_("Unexpected number of hardware breakpoint registers"
- " reported by ptrace, got %d, expected %d."),
- aarch64_num_bp_regs, AARCH64_HBP_MAX_NUM);
- aarch64_num_bp_regs = AARCH64_HBP_MAX_NUM;
- }
- aarch64_num_wp_regs = reg.db_nwtpts;
- if (aarch64_num_wp_regs > AARCH64_HWP_MAX_NUM)
- {
- warning (_("Unexpected number of hardware watchpoint registers"
- " reported by ptrace, got %d, expected %d."),
- aarch64_num_wp_regs, AARCH64_HWP_MAX_NUM);
- aarch64_num_wp_regs = AARCH64_HWP_MAX_NUM;
- }
- }
- }
- }
- /* Implement the virtual inf_ptrace_target::post_startup_inferior method. */
- void
- aarch64_fbsd_nat_target::post_startup_inferior (ptid_t ptid)
- {
- aarch64_remove_debug_reg_state (ptid.pid ());
- probe_debug_regs (ptid.pid ());
- fbsd_nat_target::post_startup_inferior (ptid);
- }
- /* Implement the "post_attach" target_ops method. */
- void
- aarch64_fbsd_nat_target::post_attach (int pid)
- {
- aarch64_remove_debug_reg_state (pid);
- probe_debug_regs (pid);
- fbsd_nat_target::post_attach (pid);
- }
- /* Implement the virtual fbsd_nat_target::low_new_fork method. */
- void
- aarch64_fbsd_nat_target::low_new_fork (ptid_t parent, pid_t child)
- {
- struct aarch64_debug_reg_state *parent_state, *child_state;
- /* If there is no parent state, no watchpoints nor breakpoints have
- been set, so there is nothing to do. */
- parent_state = aarch64_lookup_debug_reg_state (parent.pid ());
- if (parent_state == nullptr)
- return;
- /* The kernel clears debug registers in the new child process after
- fork, but GDB core assumes the child inherits the watchpoints/hw
- breakpoints of the parent, and will remove them all from the
- forked off process. Copy the debug registers mirrors into the
- new process so that all breakpoints and watchpoints can be
- removed together. */
- child_state = aarch64_get_debug_reg_state (child);
- *child_state = *parent_state;
- }
- /* Mark debug register state "dirty" for all threads belonging to the
- current inferior. */
- void
- aarch64_notify_debug_reg_change (ptid_t ptid,
- int is_watchpoint, unsigned int idx)
- {
- for (thread_info *tp : current_inferior ()->non_exited_threads ())
- {
- if (tp->ptid.lwp_p ())
- aarch64_debug_pending_threads.emplace (tp->ptid.lwp ());
- }
- }
- /* Implement the virtual fbsd_nat_target::low_delete_thread method. */
- void
- aarch64_fbsd_nat_target::low_delete_thread (thread_info *tp)
- {
- gdb_assert(tp->ptid.lwp_p ());
- aarch64_debug_pending_threads.erase (tp->ptid.lwp ());
- }
- /* Implement the virtual fbsd_nat_target::low_prepare_to_resume method. */
- void
- aarch64_fbsd_nat_target::low_prepare_to_resume (thread_info *tp)
- {
- gdb_assert(tp->ptid.lwp_p ());
- if (aarch64_debug_pending_threads.erase (tp->ptid.lwp ()) == 0)
- return;
- struct aarch64_debug_reg_state *state =
- aarch64_lookup_debug_reg_state (tp->ptid.pid ());
- gdb_assert(state != nullptr);
- struct dbreg reg;
- memset (®, 0, sizeof(reg));
- for (int i = 0; i < aarch64_num_bp_regs; i++)
- {
- reg.db_breakregs[i].dbr_addr = state->dr_addr_bp[i];
- reg.db_breakregs[i].dbr_ctrl = state->dr_ctrl_bp[i];
- }
- for (int i = 0; i < aarch64_num_wp_regs; i++)
- {
- reg.db_watchregs[i].dbw_addr = state->dr_addr_wp[i];
- reg.db_watchregs[i].dbw_ctrl = state->dr_ctrl_wp[i];
- }
- if (ptrace(PT_SETDBREGS, tp->ptid.lwp (), (PTRACE_TYPE_ARG3) ®, 0) != 0)
- error (_("Failed to set hardware debug registers"));
- }
- #else
- /* A stub that should never be called. */
- void
- aarch64_notify_debug_reg_change (ptid_t ptid,
- int is_watchpoint, unsigned int idx)
- {
- gdb_assert (true);
- }
- #endif
- void _initialize_aarch64_fbsd_nat ();
- void
- _initialize_aarch64_fbsd_nat ()
- {
- #ifdef HAVE_DBREG
- aarch64_initialize_hw_point ();
- #endif
- add_inf_child_target (&the_aarch64_fbsd_nat_target);
- }
|